钢框架减震结构性能提升设计与分析

STEEL FRAME ENERGY DISSIP ATION STRUCTURE PERFORMANCE IMPROVEMENT DESIGN AND ANALYSIS

为研究黏滞阻尼器对钢框架结构抗震性能的提升水平,以1栋5层钢框架结构为研究对象,采用黏滞阻尼器对结构进行性能提升设计,对比结构在减震前后的关键结构响应(层间位移角、楼层加速度、楼层剪力等),分析了结构的损伤状况.结果表明采用黏滞阻尼器能够很好的控制结构的损伤,减小结构的层间位移角、楼层加速度、楼层剪力.采用减震技术后,结构在大震下最大层间位移角得到较好的控制,塑性铰明显减少.除屋面层以外,结构各层的加速度均未超过4m/s2.阻尼器分担了较多的地震作用,大震下结构基底剪力明显减小.减震设计较好的提升了结构的抗震韧性,文中的研究可为钢框架减震结构设计提供参考.

Taking a 5-story steel frame structure as the case,the improvement level of seismic performance of steel frame structure by viscous dampers is studded.The key structural responses of the structure before and after energy dissipation technique adopted are analyzed in terms of inter-story drift ratio,story accelerations,story forces,and the damage status of the structure.The results show that the viscous damper can well control the damage of the struc-ture and reduce inter-story drift ratio,story accelerations,and story forces of the structure.By the energy dissipation technique,the maximum inter-story drift ratio of the structure under the maximum considered earthquake is well controlled and the plastic hinges are significantly reduced.Except for the roof of the structure,the acceleration of each story of the structure does not exceed 4m/s^(2).The damper dissipates much seismic energy,and the base reac-tions of the structure is significantly reduced under the maximum considered earthquake.The energy dissipation technique improves the seismic resilience,which provides the reference for the design of the steel frame energy dissi-pation structures.